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Developer Tools · head to head

GNAT Pro vs Packer

GNAT Pro logo

GNAT Pro

Developer Tools

Software development environments and toolchains for Ada, C/C++ and Rust

From
On request
Free plan
No
Full reviewWebsite
Packer logo

Packer

Cloud

Build automated machine images

From
Free
Free plan
Yes
Full reviewWebsite

The short version

  • Only Packer has a free tier, so it costs nothing to try first.
  • Each has a real cost: GNAT Pro no pricing published on website; requires contacting AdaCore directly for quotes; Packer packer 1.10.0 and later is licensed under the Business Source License 1.1 with IBM Corporation as licensor, not an OSI open source licence
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which GNAT Pro and Packer actually diverge.

Attributes where GNAT Pro and Packer differ
AttributeGNAT ProPacker
Starting priceOn requestFree
Pricing modelquoteopen-source
Free tierNoYes
PlatformsWebLinux, Windows, Mac
CategoryDeveloper ToolsCloud
FoundedUnknown2013

Identical on both: user rating (Not yet rated).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in GNAT Pro

Nothing recorded that Packer does not also cover.

Only in Packer

  • Image building
  • Multi-platform support
  • Provisioners
  • Builders
  • Post-processors
  • Variables
  • Data sources
  • Validation

What people use each for

The jobs each tool is most often brought in to do.

GNAT Pro

  • Building certified avionics software meeting DO-178B/C standardsnot Packer
  • Developing automotive embedded systems with ISO-26262 compliancenot Packer
  • Integrating Ada, C/C++, and Rust components in single codebasenot Packer
  • Managing software supply chain vulnerabilities and SBOMsnot Packer
  • Supporting long-lived software systems spanning decadesnot Packer

Packer

  • Building identical machine images for multiple clouds from one templatenot GNAT Pro
  • Baking golden AMIs and VM images into a CI pipelinenot GNAT Pro
  • Creating immutable infrastructure artifacts consumed by Terraformnot GNAT Pro

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

GNAT Pro

  • No pricing published on website; requires contacting AdaCore directly for quotes
  • Vendor indicates per-user, per-year subscription model but does not disclose specific costs

Packer

  • Packer 1.10.0 and later is licensed under the Business Source License 1.1 with IBM Corporation as licensor, not an OSI open source licence
  • The Additional Use Grant forbids offering Packer to third parties on a hosted or embedded basis in a paid product that competes with IBM's paid versions of Packer
  • Each version converts to the MPL 2.0 Change License only four years after that version is first published, and the Change Date is set separately per version
  • Alternative licensing for uses outside the grant must be arranged with the licensor rather than taken under the public licence

Pricing, plan by plan

GNAT Pro

On request

No published plan breakdown. See the GNAT Pro review.

Packer

Free
  • Open SourceFree
    • Multi-platform image building
    • Template-driven
    • Provisioner support

Which should you pick?

Choose GNAT Pro if

Nothing in the data separates GNAT Pro from Packer on the points above - pick on price and on how each one feels to use.

GNAT Pro review

Choose Packer if

  • You need image building.
  • You want to start without paying.
  • You work on Linux, Windows, Mac.
  • You also want multi-platform support.
Packer review

Questions people ask

Is GNAT Pro or Packer better?
Neither clearly leads. GNAT Pro starts at On request and Packer at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, GNAT Pro or Packer?
Packer has a free tier; the other does not. Paid plans start at On request for GNAT Pro and Free for Packer.
Does GNAT Pro or Packer run on more platforms?
GNAT Pro runs on Web. Packer runs on Linux, Windows, Mac.
Can I use Packer for free?
Yes. Packer has a free tier, so you can try it without paying. GNAT Pro starts at On request.
What is GNAT Pro best used for?
GNAT Pro is most often used for building certified avionics software meeting do-178b/c standards, developing automotive embedded systems with iso-26262 compliance, integrating ada, c/c++, and rust components in single codebase, managing software supply chain vulnerabilities and sboms. Of those, building certified avionics software meeting do-178b/c standards and developing automotive embedded systems with iso-26262 compliance are not what Packer is typically brought in for.
What can GNAT Pro do that Packer cannot?
Packer covers Image building, Multi-platform support, Provisioners, Builders.

Answered from the vendors’ own pages

GNAT Pro: How much does GNAT Pro cost?

GNAT Pro pricing is not published on the website. Customers must request a pricing quote by contacting AdaCore directly or speaking with a GNAT Pro expert.

Source
Packer: How much does HashiCorp Packer cost?

Packer does not publish specific pricing on its website. The open-source Packer tool is free, while HCP Packer (HashiCorp's cloud-hosted version) offers a free trial, but detailed pricing requires contacting HashiCorp.

Source
GNAT Pro: What is GNAT Pro licensing model?

GNAT Pro is sold on a per-user, per-year basis with no license locks. Customers can request pricing for their specific needs.

Source
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